package com.pengiummer.blogpublisher.wizards;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWizard;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.WizardNewProjectCreationPage;
import org.eclipse.ui.ide.IDE;
import org.w3c.dom.Document;

import com.pengiummer.blogpublisher.utils.XMLException;
import com.pengiummer.blogpublisher.utils.XMLUtils;

/**
 * This is a sample new wizard. Its role is to create a new file resource in the
 * provided container. If the container resource (a folder or a project) is
 * selected in the workspace when the wizard is opened, it will accept it as the
 * target container. The wizard creates one file with the extension "html". If a
 * sample multi-page editor (also available as a template) is registered for the
 * same extension, it will be able to open it.
 */

public class BlogPublisherNewWizard extends Wizard implements INewWizard {
	private BlogPublisherNewWizardPage page;
	private ISelection selection;
	private IWorkbench workbench;
	private WizardNewProjectCreationPage mainPage;
	private IProject project;
	private IProjectDescription projectDescription;
	private String[] natures = { "alainpannetier.gyana.nature.gyana" };

	/**
	 * Constructor for BlogPublisherNewWizard.
	 */
	public BlogPublisherNewWizard() {
		super();
		setNeedsProgressMonitor(true);
	}

	/**
	 * Adding the page to the wizard.
	 */

	public void addPages() {
		/*
		 * page = new BlogPublisherNewWizardPage(selection); addPage(page);
		 */

		mainPage = new WizardNewProjectCreationPage("New BlogPublisher project");
		mainPage.setTitle("New BlogPublisher project");
		mainPage.setDescription("Create a new BlogPublisher resource project");
		addPage(mainPage);

	}

	/**
	 * This method is called when 'Finish' button is pressed in the wizard. We
	 * will create an operation and run it using wizard as execution context.
	 */
	public boolean performFinish() {
		/*
		 * final String containerName = page.getContainerName(); final String
		 * fileName = page.getFileName(); IRunnableWithProgress op = new
		 * IRunnableWithProgress() { public void run(IProgressMonitor monitor)
		 * throws InvocationTargetException { try { doFinish(containerName,
		 * fileName, monitor); } catch (CoreException e) { throw new
		 * InvocationTargetException(e); } finally { monitor.done(); } } }; try
		 * { getContainer().run(true, false, op); } catch (InterruptedException
		 * e) { return false; } catch (InvocationTargetException e) { Throwable
		 * realException = e.getTargetException();
		 * MessageDialog.openError(getShell(), "Error",
		 * realException.getMessage()); return false; }
		 */

		project = mainPage.getProjectHandle();
		NullProgressMonitor monitor = new NullProgressMonitor();
		try {
			project.create(monitor);
			project.open(IProject.BACKGROUND_REFRESH, monitor);
			projectDescription = project.getDescription();
			projectDescription.setNatureIds(natures);
			project.setDescription(projectDescription,
					IProject.AVOID_NATURE_CONFIG | IProject.KEEP_HISTORY,
					monitor);

			IFile file = project.getFile(new Path(project.getName() + ".bpmr"));
			InputStream stream = openContentStream();
			file.create(stream, true, monitor);
			stream.close();

		} catch (CoreException e) {
			e.printStackTrace();
			return false;
		} catch (IOException e) {
			e.printStackTrace();
		} catch (XMLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return true;
	}

	/**
	 * The worker method. It will find the container, create the file if missing
	 * or just replace its contents, and open the editor on the newly created
	 * file.
	 */

	private void doFinish(String containerName, String fileName,
			IProgressMonitor monitor) throws CoreException {
		// create a sample file
		monitor.beginTask("Creating " + fileName, 2);
		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
		IResource resource = root.findMember(new Path(containerName));
		if (!resource.exists() || !(resource instanceof IContainer)) {
			throwCoreException("Container \"" + containerName
					+ "\" does not exist.");
		}
		IContainer container = (IContainer) resource;
		final IFile file = container.getFile(new Path(fileName));
		try {
			InputStream stream = openContentStream();
			if (file.exists()) {
				file.setContents(stream, true, true, monitor);
			} else {
				file.create(stream, true, monitor);
			}
			stream.close();
		} catch (IOException e) {
		} catch (XMLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		monitor.worked(1);
		monitor.setTaskName("Opening file for editing...");
		getShell().getDisplay().asyncExec(new Runnable() {
			public void run() {
				IWorkbenchPage page = PlatformUI.getWorkbench()
						.getActiveWorkbenchWindow().getActivePage();
				try {
					IDE.openEditor(page, file, true);
				} catch (PartInitException e) {
				}
			}
		});
		monitor.worked(1);
	}

	/**
	 * We will initialize file contents with a sample text.
	 * @throws XMLException 
	 */

	private InputStream openContentStream() throws XMLException {
		try {
			DocumentBuilderFactory factory = DocumentBuilderFactory
					.newInstance();
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document document = builder.newDocument();
			document.appendChild(document.createElement("BlogPublisher"));

			ByteArrayOutputStream os = new ByteArrayOutputStream();
			XMLUtils.saveDocument(document, os);
			InputStream pos = new ByteArrayInputStream(os.toByteArray());
			return pos;
		} catch (ParserConfigurationException e) {
			throw new XMLException(e);
		} catch (TransformerConfigurationException e) {
			throw new XMLException(e);
		} catch (TransformerException e) {
			throw new XMLException(e);
		}
		// String contents = "<blogpublisher></blogpublisher>";
		// return new ByteArrayInputStream(contents.getBytes());
	}

	private void throwCoreException(String message) throws CoreException {
		IStatus status = new Status(IStatus.ERROR,
				"com.pengiummer.blogpublisher", IStatus.OK, message, null);
		throw new CoreException(status);
	}

	/**
	 * We will accept the selection in the workbench to see if we can initialize
	 * from it.
	 * 
	 * @see IWorkbenchWizard#init(IWorkbench, IStructuredSelection)
	 */
	public void init(IWorkbench workbench, IStructuredSelection selection) {
		this.selection = selection;
		this.workbench = workbench;
		this.setWindowTitle("New BlogPublisher project");
	}
}